Best Free File Cleaner for Android

1Tap Cleaner (819 KB), a handy tool to free up more internal storage space on your device by clearing cache files, data files, search and navigation history records. Also includes a default cleaner to list default apps and clear their settings.

Best Free File Encryption Utility for Android

File Locker (200 KB), protect your files from unauthorized access by encoding the content and file names as well. Smart searching through folders for documents, locked and unlocked files is a plus but it can't unlock a file that has been renamed.

Best Free File Manager for Android

X-plore File Manager (1.4 MB), a file manager with a well thought-out split screen view allows you to transfer files between folders on the same device and manipulate files and folders between devices easily. Loads of features, such as built-in viewers for images, video, audio and text. No adverts. (Review)

ASTRO File Manager (2.4 MB), manage your files in Icon or List view with sorting, bookmarks, searching and other common features, plus some useful tools like checking SD card usage by folders. On the downside, the free version comes with a small ad. (Review)

Best Free File Transfer for Android

SHAREit (6.0 MB), transfer files wirelessly between Android, iPad, iPhone and Windows devices at fast speed without going through the cloud, plus advanced features such as stream and backup photos, remotely view files and control PowerPoint slideshows on your PC.

Best Free Online Backup for Android

Dropbox (6.9 MB), upload and access files from your Android, and sync them between your computers and mobile devices on the go. Easy to use—tap a file to view or press and hold it to access the menu for managing files and sharing links. (Review)

Google Drive (15 MB), store your files including documents, photos and videos in this free cloud storage up to 15GB for backup and access anywhere. You can share any files with your contacts or access files shared with you, and make files available offline. Opening up document, spreadsheet or presentation files from this app goes to the respective apps Google Docs, Google Sheets and Google Slides installed separately.

OneDrive (11.8 MB), previously known as SkyDrive, offers 7 GB of free online storage as part of Microsoft services for new subscribers. The app allows you to upload files, photos and videos from your device to OneDrive, open files in other apps and share files by sending a link. The built-in feature Camera Backup lets you upload photos and videos automatically.

Best Free Storage Manager for Android

AppMgr III (App 2 SD) (1.9 MB), take a glance where the apps are installed and move them from internal storage to the SD Card to save limited space on your device. Also clear the cache to make more space. The free version is supported by a small unobtrusive ad.

Great list Jojoyee!
I myself love to play games on my phone some now and then. I am a huge fan of racing games and I found GT Racing: Motor Academy Free+ to be one of the best free games around. It is a 400MB download, but if you have a WiFi connection it's worth downloading it.

There's a game... I think it's called 3D Cats or 3D Flying Cats.... it's pretty addictive too but is a battery drainer. The cat meoows when you crash sometimes growls a bit, actumy feel bad for smashing his rocket into a wall.

Es file explorer is universally the best file manager in terms of simplicity and options. Have used it on both HTC and Samsung.

SuperSU is better than Superuser IMHO especially now with the new updates.

Google Drive is awesome for storage space and versatility as you can open and create virtually anything using docs without having to install office software. Kingston Office I think its called is an amazing free office manager of you want one.

While loitering around Google Play I found this app called SURDOC. This is basically an online backup app. They are presently offering a ridiculous 100GB of storage for a year . So if anyone is looking for a temporary harddisk online you may want to give it a try. Though the survival of the service remains to be seen...

Note :
1. The 100 GB is available via the app store only.
2. Last date to get that much space seems to be 15-01-2013.
3. Only Almighty knows the catch behind?

Agreed. A business model like this is unsustainable. They will either go bust like so many others before them or become no more competitive than the already established services. IMO I would not trust this as my only solution at this time. MC - Site Manager.